package com.digital.welcome.util;

import javax.servlet.http.HttpServletRequest;

public class IpUtil {
    public static String getIPAddress(HttpServletRequest request)
    {
        String ip = null;
        //X-Forwarded-For：Squid 服务代理
        String ipAddresses = request.getHeader("X-Forwarded-For");

        if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses))
        {
            //Proxy-Client-IP：apache 服务代理
            ipAddresses = request.getHeader("Proxy-Client-IP");
        }
        if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses))
        {
            //WL-Proxy-Client-IP：weblogic 服 务代理 12345678910111213141516171819
            ipAddresses = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses))
        {
            //HTTP_CLIENT_IP：有些代理服务器
            ipAddresses = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses))
        {
            //X-Real-IP：nginx服务代理
            ipAddresses = request.getHeader("X-Real-IP");
        }
        //有些网络通过多层代理，那么获取到的ip就会有 多个，一般都是通过逗号（,）分割开来，并且第一个ip为客户 端的真实IP
        if (ipAddresses != null && ipAddresses.length() != 0)
        {
            ip = ipAddresses.split(",")[0];
        }
        //还是不能获取到，最后再通过 request.getRemoteAddr();获取
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses))
        {
            ip = request.getRemoteAddr();
        }
        if (ip.equals("0:0:0:0:0:0:0:1"))//IPV6的IP
        {
            ip = "localhost";
        }

        return ip;
    }
}
